android例子

1. android sdk中自带的例子怎样运行

新建一个android project 在创建画面选择Create project frome exceting
sourse 接着选择android版本。然后location里面选择你sdk文件夹下sample/androi-7/ApiDemos 这个文件夹 apidemos文件夹下面就是所有的例子程序。建立以后右键点击选择Run us菜单下面第一个选项运行它。

就会自动建立一个虚拟机跑起来这个例子程序了。

里面是各种组件的代码...

希望你满意我的答案

2. 关于android permission的例子

额，公司不允许发送带附件的邮件，所以只能找个简单的贴代码了。。。
这是activity的代码：
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
TextView tv=new TextView(this);
String st="";

ContentResolver cr=getContentResolver();
Cursor cu=cr.query(ContactsContract.Contacts.CONTENT_URI,
null,null,null,null);

while(cu.moveToNext())
{
int name=cu.getColumnIndex(PhoneLookup.DISPLAY_NAME);
String contact=cu.getString(name);
int number=cu.getColumnIndex(PhoneLookup.NUMBER);
String num=cu.getString(number);

st+=(contact+":"+num+"\n");
}
cu.close();
tv.setText(st);
setContentView(tv);
}
还要在androidmanifest.xml中声明permission：
<manifest package="map.google" android:versionCode="1" android:versionName="1.0">
−
<application android:icon="@drawable/icon" android:label="@string/app_name">
−
<activity android:name=".helloGoogle" android:label="@string/app_name">
−
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.READ_CONTACTS"/>
</manifest>

实现的功能很简单，从联系人中读出名字和号码～～～

3. 如何导入android中的sample例子

导入Android SDK自带的Sample:
Android SDK 提供了许多非常经典的sample，这些Sample都有非常详细的注释（可惜是英文的，不过应该能看懂），对于学习非常有用。
打开Eclipse选择“File”–>"new"–>"Android Poject"
选中"Create Project from existing sample"
接下来选择合适的Buid Target，要和你的虚拟机版本相对应
在Select Sample界面选择一个sample，点击Finish即可

4. android 代码布局简单的例子

（引用楼上的例子）
//初始化线性布局
LinearLayout linearLayout = new LinearLayout(context);
//设定线性布局的方向为竖直方向
linearLayout.setOrientation(LinearLayout.VERTICAL);
//设定线性布局的填充方式为自适应
linearLayout.setLayoutParams(new LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
//设定线性布局内的对齐方式为控件水平居中
linearLayout.setGravity(Gravity.CENTER_HORIZONTAL);
//初始化图片按钮

ImageButton news = new ImageButton(context);
//设定图片按钮的id
news.setId(85);
//为图片按钮设定监听器
news.setOnClickListener(this);
//为图片按钮设定图片
news.setBackgroundResource(R.drawable.news);
//设定图片按钮的属性
news.setLayoutParams(new LayoutParams(33, 33));
//将图片按钮加入线性布局

linearLayout.addView(news);

简单的小例子就像上面这样了，其实很简单，就像 你要盖一间房子，里面有桌子板凳什么的，你就要设定桌子板凳的各种属性，长宽高颜色，样式什么的，然后 设定 桌子板凳放到 什么位置，最后 把桌子板凳按照你的想法 放在那个位置上就好了。

5. android 的api使用方法 举个使用的例子 回答必给积分

如compareTo这个api是一个比较大小的api
以下是商店离手机用户距离的排序实例：
// 开始排序
private void Sorting(ArrayList<Integer> temp_km, ArrayList<Integer> temp_Adv_id ) {
// TODO Auto-generated method stub

for (int i = 0; i < temp_km.size() - 1; i++) {
for (int j = 1; j < temp_km.size() - i; j++) {
Integer a;
Integer b;
if ((temp_km.get(j - 1)).compareTo(temp_km.get(j)) > 0) { // 比较两个整数的大小
a = temp_km.get(j - 1);
b = temp_Adv_id.get(j - 1);
temp_km.set((j - 1), temp_km.get(j));
temp_Adv_id.set((j - 1), temp_Adv_id.get(j));
temp_km.set(j, a);//获得重新排序后距离数组
temp_Adv_id.set(j, b);//商店在数组中的真实ID
}
}
}
希望对您有帮助。

6. android一个自定义View的例子

//我只说我的理解，并不一定正确，不喜勿碰，望给君帮助。

private Drawable drawable = null;//此处，仅只有一个drawable资源，把它改成数组试试，并放入不同的drawable

private Context mcontext=null;
public FrameGameView(Context context) {
super(context);
// TODO Auto-generated constructor stub
mcontext = context;
frameAnimation = new AnimationDrawable();
for(int i=1;i<=15;i++){//虽然有for数字循环，但drawable却只有一个，也就只会出现一张图的现象
int id = getResources().getIdentifier("a"+i, "drawable", mcontext.getPackageName());
drawable =getResources().getDrawable(id);
frameAnimation.addFrame(drawable, 500);
}

7. android的例子

android:layout_width="fill_parent"android:layout_height="fill_parent"
xmlns:android="schemas.android/apk/res/android"
android:orientation="vertical">
android:layout_width="fill_parent">
android:layout_width="wrap_content"android:layout_height="wrap_content">
android:layout_height="wrap_content"android:text="播放音频">
android:layout_height="wrap_content"android:text="停止播放">

android:layout_width="fill_parent">
android:layout_width="fill_parent"android:layout_height="250px">
android:layout_width="wrap_content"android:layout_height="wrap_content">
android:layout_height="wrap_content"android:id="@+id/Button03"
android:text="播放视频">
android:layout_height="wrap_content"android:text="停止播放"android:id="@+id/Button04">
packagecom.testMedia;
importjava.io.IOException;
importjava.util.Timer;
importjava.util.TimerTask;
importandroid.app.Activity;
importandroid.media.AudioManager;
importandroid.media.MediaPlayer;
importandroid.os.Bundle;
importandroid.view.SurfaceHolder;
importandroid.view.SurfaceView;
importandroid.view.View;
importandroid.widget.Button;
importandroid.widget.SeekBar;
importandroid.widget.Toast;
{
/**.*/
privateSeekBarskb_audio=null;
privateButtonbtn_start_audio=null;
privateButtonbtn_stop_audio=null;
privateSeekBarskb_video=null;
privateButtonbtn_start_video=null;
privateButtonbtn_stop_video=null;
privateSurfaceViewsurfaceView;

8. 谁有没有Android串口的使用例子

1 首先做的是创建新的工程然后添加一下文件

3代码

好了 然后就是关于这个页面的Code了，

这是我的：

package android.serialport;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.BreakIterator;
import java.util.ServiceConfigurationError;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MyserialActivity extendsActivity
{
EditText sendedit;
EditText receiveedit;
FileInputStream mInStream;
FileOutputStream mOutStream;
SerialPort classserialport;
ReadThread mReadThread;

private class ReadThread extends Thread
{
public void run()
{
super.run();
while(!isInterrupted())
{
int size;
}
}
}


void onDataReceive(final byte[] buffer,finalint size)
{
runOnUiThread(new Runnable()
{

@Override
publicvoid run()
{
// TODO Auto-generated method stub
if(mReadThread != null)
{
receiveedit.append(newString(buffer,0,size));
}
}
});
}
@Override
protectedvoid onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_myserial);

sendedit= (EditText)findViewById(R.id.editText1);
receiveedit=(EditText)findViewById(R.id.editText2);


receiveedit.setFocusable(false);//进制输入
/*
* 打开串口
* */
finalButton openserial =(Button)findViewById(R.id.button1);
openserial.setOnClickListener(newView.OnClickListener()
{

@Override
publicvoid onClick(View arg0)
{
//TODO Auto-generated method stub
try
{
classserialport=new SerialPort(new File("/dev/ttyS2"),9600);
}catch(SecurityExceptione)
{
e.printStackTrace();
}
catch(IOExceptione)
{
e.printStackTrace();
}
mInStream=(FileInputStream) classserialport.getInputStream();
Toast.makeText(MyserialActivity.this,"串口打开成功",Toast.LENGTH_SHORT).show();
}
});
/*
* 发送数据
* */
finalButton sendButton =(Button)findViewById(R.id.button2);
sendButton.setOnClickListener(newView.OnClickListener()
{

@Override
publicvoid onClick(View arg0)
{

Stringindata;
indata=sendedit.getText().toString();
//TODO Auto-generated method stub
try
{
mOutStream=(FileOutputStream) classserialport.getOutputStream();
mOutStream.write(indata.getBytes());
mOutStream.write(' ');
}
catch(IOExceptione)
{
e.printStackTrace();
}
Toast.makeText(MyserialActivity.this,"数据发送成功",Toast.LENGTH_SHORT).show();
sendedit.setText("");
}
});
/*
* 接收数据
* */
finalButton receButton= (Button)findViewById(R.id.button3);
receButton.setOnClickListener(newView.OnClickListener()
{//inttag =0;

@Override
publicvoid onClick(View arg0)
{
// TODO Auto-generated method stub
intsize;
try
{
byte[]buffer = new byte[64];
if(mInStream== null) return;
size= mInStream.read(buffer);
if(size>0)
{
receiveedit.setText("");

}
if(size>0)
{
onDataReceive(buffer,size);
}
inttag =1;

receiveedit.setText(newString(buffer, 0, size));

}catch(IOExceptione)
{
e.printStackTrace();
return;
}
}

privateboolean isInterrupted()
{
// TODO Auto-generated methodstub
returnfalse;
}
});
/*
* 清楚接收区
* */
finalButton ClearButton = (Button)findViewById(R.id.clear);
ClearButton.setOnClickListener(newView.OnClickListener()
{

@Override
publicvoid onClick(View arg0)
{
//TODO Auto-generated method stub
receiveedit.setText("");
}
});}

@Override
publicboolean onCreateOptionsMenu(Menu menu)
{
//Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.myserial,menu);
returntrue;
}

}

好吧 你做好了。

3需要加载的文件

下面我把所需要添加的代码贴一贴

第一个是Serialport.java

/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package android.serialport;

import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.util.Log;

public class SerialPort {

private static final String TAG = "SerialPort";

/*
* Do not remove or rename the field mFd: it is used by native method close();
*/
private FileDescriptor mFd; //创建一个文件描述符对象 mFd
private FileInputStream mFileInputStream;
private FileOutputStream mFileOutputStream;

public SerialPort(File device, int baudrate) throws SecurityException, IOException {
/*
* 检查访问权限
* */
/* Check access permission */
if (!device.canRead() || !device.canWrite()) {//如果设备不可读或者设备不可写
try {
/* Missing read/write permission, trying to chmod the file *///没有读写权限，就尝试去挂载权限
Process su; //流程进程 su
su = Runtime.getRuntime().exec("/system/bin/su");//通过执行挂载到/system/bin/su 获得执行
String cmd = "chmod 777 " + device.getAbsolutePath() + " "
+ "exit ";
/*String cmd = "chmod 777 /dev/s3c_serial0" + " "
+ "exit ";*/
su.getOutputStream().write(cmd.getBytes());//进程。获得输出流。写（命令。获得二进制）
if ((su.waitFor() != 0) || !device.canRead()
|| !device.canWrite()) {//如果 进程等待不是0 或者 设备不能读写就
throw new SecurityException();//抛出一个权限异常
}
} catch (Exception e) {
e.printStackTrace();
throw new SecurityException();
}
}
/*
*
* */
mFd = open(device.getAbsolutePath(), baudrate);
//device.getAbsolutePath()这是要挂载的路径new File("/dev/ttyS2")
if (mFd == null) {
Log.e(TAG, "native open returns null");
throw new IOException();//输入输出异常
}
//将文件描述符 做输入输出流的参数 传递给创建的输入输出流
mFileInputStream = new FileInputStream(mFd);
mFileOutputStream = new FileOutputStream(mFd);
}

// Getters and setters
public InputStream getInputStream() {
return mFileInputStream;
}

public OutputStream getOutputStream() {
return mFileOutputStream;
}

// JNI
private native static FileDescriptor open(String path, int baudrate);
public native void close();
static {
System.loadLibrary("serial_port");
}
}

第二个是SerialPortFinder.java

/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package android.serialport;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
import java.util.Iterator;
import java.util.Vector;

import android.util.Log;

public class SerialPortFinder {

/*
* 创建一个驱动程序类
* */
public class Driver {
public Driver(String name, String root) {
mDriverName = name;//String 类型的
mDeviceRoot = root;
}
private String mDriverName;
private String mDeviceRoot;
Vector<File> mDevices = null;
/*
* Vector 类在 java 中可以实现自动增长的对象数组
* 简单的使用方法如下：
vector<int> test;//建立一个vector
test.push_back(1);
test.push_back(2);//把1和2压入vector这样test[0]就是1,test[1]就是2
* */
public Vector<File> getDevices() {
if (mDevices == null) {
mDevices = new Vector<File>();
File dev = new File("/dev");
File[] files = dev.listFiles();
int i;
for (i=0; i<files.length; i++) {
if (files[i].getAbsolutePath().startsWith(mDeviceRoot)) {
Log.d(TAG, "Found new device: " + files[i]);
mDevices.add(files[i]);
}
}
}
return mDevices;
}

public String getName() {
return mDriverName;
}
}
/*
*
*
* */
private static final String TAG = "SerialPort";

private Vector<Driver> mDrivers = null;

Vector<Driver> getDrivers() throws IOException {
if (mDrivers == null) {
mDrivers = new Vector<Driver>();
LineNumberReader r = new LineNumberReader(new FileReader("/proc/tty/drivers"));
String l;
while((l = r.readLine()) != null) {
String[] w = l.split(" +");
if ((w.length == 5) && (w[4].equals("serial"))) {
Log.d(TAG, "Found new driver: " + w[1]);
mDrivers.add(new Driver(w[0], w[1]));
}
}
r.close();
}
return mDrivers;
}

public String[] getAllDevices() {
Vector<String> devices = new Vector<String>();
// Parse each driver
Iterator<Driver> itdriv;
try {
itdriv = getDrivers().iterator();
while(itdriv.hasNext()) {
Driver driver = itdriv.next();
Iterator<File> itdev = driver.getDevices().iterator();
while(itdev.hasNext()) {
String device = itdev.next().getName();
String value = String.format("%s (%s)", device, driver.getName());
devices.add(value);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return devices.toArray(new String[devices.size()]);
}

public String[] getAllDevicesPath() {
Vector<String> devices = new Vector<String>();
// Parse each driver
Iterator<Driver> itdriv;
try {
itdriv = getDrivers().iterator();
while(itdriv.hasNext()) {
Driver driver = itdriv.next();
Iterator<File> itdev = driver.getDevices().iterator();
while(itdev.hasNext()) {
String device = itdev.next().getAbsolutePath();
devices.add(device);
}
}
} catch (IOException e) {
e.printStackTrace();
}
return devices.toArray(new String[devices.size()]);
}
}

第三个是Android.mk

#
# Copyright 2009 Cedric Priscal
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

TARGET_PLATFORM := android-3
LOCAL_MODULE := serial_port
LOCAL_SRC_FILES := SerialPort.c
LOCAL_LDLIBS := -llog

include $(BUILD_SHARED_LIBRARY)

第四个是SerialPort.c

/*
* Copyright 2009 Cedric Priscal
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

#include <termios.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <jni.h>

#include "android/log.h"
static const char *TAG="serial_port";
#define LOGI(fmt, args...) __android_log_print(ANDROID_LOG_INFO, TAG, fmt, ##args)
#define LOGD(fmt, args...) __android_log_print(ANDROID_LOG_DEBUG, TAG, fmt, ##args)
#define LOGE(fmt, args...) __android_log_print(ANDROID_LOG_ERROR, TAG, fmt, ##args)

static speed_t getBaudrate(jint baudrate)
{
switch(baudrate) {
case 0: return B0;
case 50: return B50;
case 75: return B75;
case 110: return B110;
case 134: return B134;
case 150: return B150;
case 200: return B200;
case 300: return B300;
case 600: return B600;
case 1200: return B1200;
case 1800: return B1800;
case 2400: return B2400;
case 4800: return B4800;
case 9600: return B9600;
case 19200: return B19200;
case 38400: return B38400;
case 57600: return B57600;
case 115200: return B115200;
case 230400: return B230400;
case 460800: return B460800;
case 500000: return B500000;
case 576000: return B576000;
case 921600: return B921600;
case 1000000: return B1000000;
case 1152000: return B1152000;
case 1500000: return B1500000;
case 2000000: return B2000000;
case 2500000: return B2500000;
case 3000000: return B3000000;
case 3500000: return B3500000;
case 4000000: return B4000000;
default: return -1;
}
}

/*
* Class: cedric_serial_SerialPort
* Method: open
* Signature: (Ljava/lang/String;)V
*/
JNIEXPORT jobject JNICALL Java_android_serialport_SerialPort_open
(JNIEnv *env, jobject thiz, jstring path, jint baudrate)
{
int fd;
speed_t speed;
jobject mFileDescriptor;

/* Check arguments */
{
speed = getBaudrate(baudrate);
if (speed == -1) {
/* TODO: throw an exception */
LOGE("Invalid baudrate");
return NULL;
}
}

/* Opening device */
{
jboolean is;
const char *path_utf = (*env)->GetStringUTFChars(env, path, &is);
LOGD("Opening serial port %s", path_utf);
fd = open(path_utf, O_RDWR | O_DIRECT | O_SYNC);
LOGD("open() fd = %d", fd);
(*env)->ReleaseStringUTFChars(env, path, path_utf);
if (fd == -1)
{
/* Throw an exception */
LOGE("Cannot open port");
/* TODO: throw an exception */
return NULL;
}
}

/* Configure device */
{
struct termios cfg;
LOGD("Configuring serial port");
if (tcgetattr(fd, &cfg))
{
LOGE("tcgetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}

cfmakeraw(&cfg);
cfsetispeed(&cfg, speed);
cfsetospeed(&cfg, speed);

if (tcsetattr(fd, TCSANOW, &cfg))
{
LOGE("tcsetattr() failed");
close(fd);
/* TODO: throw an exception */
return NULL;
}
}

/* Create a corresponding file descriptor */
{
jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor");
jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "<init>", "()V");
jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I");
mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor);
(*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd);
}

return mFileDescriptor;
}

/*
* Class: cedric_serial_SerialPort
* Method: close
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_android_serialport_SerialPort_close
(JNIEnv *env, jobject thiz)
{
jclass SerialPortClass = (*env)->GetObjectClass(env, thiz);
jclass FileDescriptorClass = (*env)->FindClass(env, "java/io/FileDescriptor");

jfieldID mFdID = (*env)->GetFieldID(env, SerialPortClass, "mFd", "Ljava/io/FileDescriptor;");
jfieldID descriptorID = (*env)->GetFieldID(env, FileDescriptorClass, "descriptor", "I");

jobject mFd = (*env)->GetObjectField(env, thiz, mFdID);
jint descriptor = (*env)->GetIntField(env, mFd, descriptorID);

LOGD("close(fd = %d)", descriptor);
close(descriptor);
}

9. 菜鸟求教！做android例子时出现这种情况这么办啊两行文字重叠了！

把你的RelativeLayout换成LinearLayout 或者在RelativeLayout布局中的两个TextView textView1，textview2 textView1的Id是@+id/textView1 那么textView2要多加一个属性 android：layout_below=“@+id/textView1”就OK了 请采纳

10. 谁能帮我写个Android的ImageButton例子呀，class和xml都要

1、使用Eclipse新建一个android的项目，取名ImageButton（名字随意）

2、在项目目录res下新建一个目录drawable，把你要的按钮图片拷贝到该目录下（我的图片名字是email.gif）。

3、在res/layout/main.xml中加入一个button节点，如下代码：

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

>

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/hello"

/>

<Button

android:id="@+id/btn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:background="@drawable/email"

/>

</LinearLayout>

以上在Button节点中指定了android:background="@drawable/email"，主要就是这里了。

效果如下：